Plug in the power supply, after 60 seconds of preheating, a green light is displayed to indicate normal operation.
When the device encounters a power outage, the 9V battery backup function plays a very big role in continuing to supply power to the device so that it can continue to operate.
| Model | KH522 |
| Power supply | Plug-in |
| Battery backup | 9v |
| Alarm Current | <120 (mA) |
| Operating Temperature | -20°C - 50°C (°C) |
| Moisture Determination Range | 15%-90% RH |